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Organism without a brain creates external memories for navigation
- Groxx 14y agotl;dr: it's a slime mold which avoids spreading where it has already spread (which are 'slimed' - a chemical marker, at the very least). That might be stretching "external memories" a bit far, for hype's sake. Not that slime molds aren't fascinating, but what's with the hyperbolic word choices?
- kevingadd 14y agoI think "external memories" is a reasonable term for this. If you treat it as an analogue to the computer science definition of memory - a place to store information - then it's a pretty decent way of describing what's happening here. I suppose the fact that the information is being stored at the location it describes, instead of in a central location, makes it a bit weird?
- pyre 14y agoHow does one slime mold react to the 'slime' left by another?
- Lockyy 14y agoUnless the slime the researchers planted was from the slime-mold being experimented upon we can assume that they react in the same way to other slime-mold's slime as to their own.
- jamesrcole 14y agoI suppose the fact that the information is being stored at the location it describes, instead of in a central location, makes it a bit weird? "weird" is emotional response. I think that function is the appropriate criteria here. Functionally, it is serving as memory. There's no magic difference between inside the body and outside of it. Richard Dawkins' The Extended Phenotype http://www.amazon.com/Extended-Phenotype-Reach-Popular-Science/dp/0192880519 http://www.amazon.com/Extended-Phenotype-Reach-Popular-Scien... is a good read on this sort of stuff (it's a little bit more technical than his other books, but still readable by someone without a biology background).
- Groxx 14y agoI'd be willing to bet the mold grows generally away from the most-dense areas (say, the interior of a glob). This makes sense energy wise - would you also call that "remembering" where it was? Similarly, many plants "lean" to point towards the sun. Are they "remembering" where the sun is with the increased growth on the far side? You can (successfully) argue that it can be an accurate description. It is. I would argue that it's deliberately choosing words that invoke more interest (be it scientific or "OMGWHAT") than accuracy.
- jmmcd 14y ago> Similarly, many plants "lean" to point towards the sun. Are they "remembering" where the sun is with the increased growth on the far side? If they had put the sun there first, then yeah, that would be external memory. That's the difference.
- Groxx 14y agoNo, plants which do this generally grow less on the sunny side of their stalk. They are putting more / larger cells on the far side, as a form of memory. A crude counting system, if you will - when side A > side B, side B is where the sun is. Arguably this is even more complex than a mere external memory system - it deals in continuous ratios, rather than booleans!
- jmmcd 14y agoHmm. If you're just talking about the extra growth, then that's not even external. I don't think it's a good example.
- Groxx 14y agoNot of an external memory system, no. This would be internal. But would you call it "an internal memory system", or "decreased growth in reaction to sunlight"? Another option: (micro-)evolution. Is an amoeba's resistance to a chemical "memory", or an environment-selected random mutation? Again, technically it can be viewed as memory, but it's diluting the term so far as to make it a catch-all for any kind of information, ever, to get someone to click on a link.
- silvio 14y agoThe mechanism described in the article, that slime mold uses slime to mark an area as it is exploring it to avoid exploring it again on a later pass, eerily reminds me of graph traversal algorithms.
- qbrass 14y agohttp://news.ycombinator.com/item?id=3970427 http://news.ycombinator.com/item?id=3970427 Using A Slime-Mold To Calculate Minimum Spanning Trees
- praptak 14y agoThis article researches robots that explore unknown graphs and can place pebbles to distinguish nodes: "The Power of a Pebble: Exploring and Mapping Directed Graphs (1998)" by Michael A. Bender , Antonio Fernandez , Dana Ron , Amit Sahai , Salil Vadhan http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.19.2161 http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.19.2...
- pawelwentpawel 14y agoHere is an interesting video from BBC on how slime mold recreates the tokyo railroad plan and solves mazes - http://www.youtube.com/watch?v=sNAxrpzc6ws&feature=player_detailpage#t=3826s http://www.youtube.com/watch?v=sNAxrpzc6ws&feature=playe...
- gojomo 14y agoSelf-stigmergy? http://en.wikipedia.org/wiki/Stigmergy http://en.wikipedia.org/wiki/Stigmergy
- GauntletWizard 14y agoI think it's only a matter of time before we prove slime-molds to be turing-complete.
- cmccabe 14y agoOrganism without a brain creates external memories for navigation A manager downloaded a TODO list app?
- ktizo 14y agoThis is more or less how I find my way around in the morning. The only major difference is that I generally use coffee-spills and biscuits as location markers, instead of slime.
- netcan 14y agoI'm not exactly sure how to phrase this question: Are there any / what are the best examples of concurrent evolution of intelligence? What do we know about For example, I know that Cephalopods like octopi seem to have developed a high level of intelligence despite being far removed (>500m years) from other known intelligent animals (mostly vertebrates). This shows us how a less centralized nervous system can produce "intelligence". What do we know out the origins/early appearances of things like memory, reflexes, instincts…? Was it something like this slime stuff? Are there multiple implementations out there? Are they fundamentally limited or did our just happen to "advance" the most.
- waivej 14y agoOne of these crawled out of our compost bucket through the foam filter and onto the ground. It took about three days and the slime trail would dry over time so it really moved. I was fascinated and a little unnerved by it. It looked intelligent yet able to separate and reform.
- adjwilli 14y agoI can't wait to read a sci-fi story about advanced and perhaps sentient slime molds taking over the universe.
- tessellated 14y agoSteven Baxter's Xeelee Sequence comes to mind.
- daralthus 14y agoThe Blob (1958) http://www.imdb.com/title/tt0051418/ http://www.imdb.com/title/tt0051418/